The Cowboys released a statement, "Dallas Cowboys quarterback Tony Romo underwent successful surgery on his left clavicle today. He is expected to undergo a six-to-eight week period of recovery and treatment before returning to football related activity."

Baylor orthopedic surgeon Dr. Robert Berry, a former NFL team doctor, said the procedure is common and simple.

The condition occurs when hits on the football field cause the collarbone to grind along the adjacent bone.